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## Main Question or Discussion Point

Does the mathematical exp (F

F

simply mean that the mechanical system will be in equilibrium if the constraint forces do no work?

Can someone elaborate on what a dynamic equilibrium means and how it differs from static mathematically?

^{a}-dp/dt).dr = 0F

^{a}being applied force, p being momentum, dr being virtual displacementsimply mean that the mechanical system will be in equilibrium if the constraint forces do no work?

Can someone elaborate on what a dynamic equilibrium means and how it differs from static mathematically?